Cây 1: http://www.upsieutoc.com/image/cTjgI1 http://www.upsieutoc.com/image/cTj1lO http://www.upsieutoc.com/image/cTj7iG http://www.upsieutoc.com/image/cTjbWE Cây 2: http://www.upsieutoc.com/image/cTj6aN http://www.upsieutoc.com/image/cTjU7y http://www.upsieutoc.com/image/cTgRHY
